<template>
  <div class="component-upload-image">
    <el-upload multiple :action="uploadImgUrl" list-type="picture-card" :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload" :limit="limit" :on-error="handleUploadError" :on-exceed="handleExceed"
      ref="imageUpload" :before-remove="handleDelete" :show-file-list="true" :headers="headers" :file-list="fileList"
      :on-preview="handlePictureCardPreview" :class="{ hide: fileList.length >= limit }">
      <el-icon class="avatar-uploader-icon">
        <plus />
      </el-icon>
    </el-upload>
    <!-- 上传提示 -->
    <div class="el-upload__tip" v-if="showTip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
    </div>

    <el-dialog v-model="dialogVisible" title="预览" width="800px" append-to-body>
      <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
    </el-dialog>
  </div>
</template>

<script setup>
  import { getToken } from "@/utils/auth";

  const props = defineProps({
    modelValue: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["png", "jpg", "jpeg", "webp"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
  });

  const { proxy } = getCurrentInstance();
  const emit = defineEmits(["change"]);
  const number = ref(0);
  const uploadList = ref([]);
  const dialogImageUrl = ref("");
  const dialogVisible = ref(false);
  const baseUrl = import.meta.env.VITE_APP_BASE_API;
  const uploadImgUrl = ref(
    import.meta.env.VITE_APP_BASE_API + "/resource/oss/upload"
  ); // 上传文件服务器地址
  // const headers = ref({ Authorization: "Bearer " + getToken() });
  const headers = ref({ Authorization: getToken() });

  const fileList = ref([]);
  const showTip = computed(
    () => props.isShowTip && (props.fileType || props.fileSize)
  );

  watch(
    () => props.modelValue,
    (val) => {
      if (val) {
        // 首先将值转为数组
        const list = Array.isArray(val) ? val : props.modelValue.split(",");
        // 然后将数组转为对象数组
        fileList.value = list
          .map((item) => ({ name: item, url: item }))
          .filter((f) => f.url !== undefined);
        // fileList.value = fileList.value.concat(Arr).filter(f => f.url !== undefined)
      } else {
        fileList.value = [];
        return [];
      }
    },
    { deep: true, immediate: true }
  );

  // 上传前loading加载
  function handleBeforeUpload(file) {
    let isImg = false;
    if (props.fileType.length) {
      let fileExtension = "";
      if (file.name.lastIndexOf(".") > -1) {
        fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
      }
      isImg = props.fileType.some((type) => {
        if (file.type.indexOf(type) > -1) return true;
        if (fileExtension && fileExtension.indexOf(type) > -1) return true;
        return false;
      });
    } else {
      isImg = file.type.indexOf("image") > -1;
    }
    if (!isImg) {
      proxy.$modal.msgError(
        `文件格式不正确, 请上传${props.fileType.join("/")}图片格式文件!`
      );
      return false;
    }
    if (props.fileSize) {
      const isLt = file.size / 1024 / 1024 < props.fileSize;
      if (!isLt) {
        proxy.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
        return false;
      }
    }
    proxy.loading("正在上传图片，请稍候...");
    number.value++;
  }

  // 文件个数超出
  function handleExceed() {
    proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
  }

  // 上传成功回调
  function handleUploadSuccess(res, file) {
    proxy.closeLoading();
    if (res.code === 200) {
      uploadList.value.push({ name: res.data.fileName, url: res.data.url });
      uploadedSuccessfully();
    } else {
      number.value--;
      proxy.closeLoading();
      proxy.$modal.msgError(res.msg);
      proxy.$refs.imageUpload.handleRemove(file);
      uploadedSuccessfully();
    }
  }

  // 删除图片
  function handleDelete(file) {
    const findex = fileList.value.map((f) => f.name).indexOf(file.name);
    if (findex > -1 && uploadList.value.length === number.value) {
      fileList.value.splice(findex, 1);
      emit("update:modelValue", listToString(fileList.value));
      return false;
    }
  }

  // 上传结束处理
  function uploadedSuccessfully() {
    if (number.value > 0 && uploadList.value.length === number.value) {
      fileList.value = fileList.value
        .concat(uploadList.value)
        .filter((f) => f.response == undefined);
      uploadList.value = [];
      number.value = 0;
      emit("update:modelValue", listToString(fileList.value));
      proxy.closeLoading();
    }
  }

  // 上传失败
  function handleUploadError() {
    proxy.$modal.msgError("上传图片失败");
    proxy.closeLoading();
  }

  // 预览
  function handlePictureCardPreview(file) {
    dialogImageUrl.value = file.url;
    dialogVisible.value = true;
  }

  // 对象转成指定字符串分隔
  function listToString(list, separator) {
    return list.map((t) => t.url).join(",");
  }
</script>

<style scoped lang="scss">
  // .el-upload--picture-card 控制加号部分
  :deep(.hide .el-upload--picture-card) {
    display: none;
  }
</style>